309.35 When surveys required. Before proceeding to the construction of any road or roads included in the secondary road construction program where the grading, exclusive of bridges and culverts, is estimated to cost over ten thousand dollars per mile, the county engineer shall cause detailed surveys and plans for the road or roads to be prepared. [C24, 27, §4643; C31, 35, §4644-c37; C39, §4644.35; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §309.35] 2001 Acts, ch 32, §2
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